[PORTABLE FOLDING DESIGN] Mini handheld fan is only the size of the palm. Featuring a portable folding design, it measures 3.15 x 3.15 x 1.38 inches and weighs only 5.3 oz, making it easy to carry in a backpack or pocket without adding bulk or weight. [LONG-LASTING BATTERY] The portable fan has a built-in 3000mAh rechargeable battery, providing up to 13 hours at low speed, 8 hours at medium speed, and 4 hours at maximum speed. Includes a USB charging cable for convenient charging, ensuring long-lasting cooling performance. [EMERGENCY POWER BANK] With a 3000mAh battery capacity, this fan can also function as an emergency power bank. The built-in USB output port allows you to charge your phone in critical situations, helping prevent unexpected shutdowns. [POWERFUL & QUIET] Equipped with a high-quality seven-blade fan and a brushless motor, this fan delivers strong airflow with minimal noise. Operating as low as 15 dB on low speed and up to 35 dB on high speed, it remains quiet enough for use in libraries or quiet environments. [VERSATILITY FAN] This rechargeable personal fan is not limited to handheld use. The folding design allows it to be adjusted to any angle for use as a mini desktop fan. Includes a lanyard for neck-hanging wear, providing hands-free cooling when needed. 2021 UPGRADED VERSION After extensive research and testing of various handheld fans, this F20 mini portable fan was designed to meet customer needs and aesthetic preferences. Continuous innovation ensures improved performance. New feature: Built-in phone holder allows you to enjoy a cool breeze while using your mobile device. Portability: The mini portable fan features a folding design, measuring 6.37 x 1.35 inches when folded—compact enough to fit comfortably in a pocket or backpack. Practicality: The folding design enables multiple uses—handheld, desktop, or neck-hanging with the included lanyard. Adjustable angles provide customized airflow. Durability: Built-in 3000mAh rechargeable battery supports up to 4 hours at high speed and up to 13 hours at low speed. The USB output port doubles as an emergency power bank to charge your phone when needed. Powerful Performance: Features high-quality seven-blade fan blades and a brushless motor to generate strong airflow with ultra-low noise. Three adjustable speed settings suit various environments. Maximum noise level is under 35 decibels, ensuring quiet operation. SPECIFICATIONS: Battery Type: Rechargeable Li-ion battery 3000mAh Input Current: DC5V/1.0A USB Output Power: 5W Charging Time: 4 hours Working Time: 4–13 hours Speed Levels: 3 speed settings Speed 1: Up to 13 hours runtime Speed 2: Up to 8 hours runtime Speed 3: Up to 4 hours runtime